<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Canvas drag and drop: helper file</title>
<style type="text/css">
div
	{width:20px;
	height:20px;
	background-color:green;}
</style>
<script type="application/ecmascript">
function start(event)
	{event.dataTransfer.effectAllowed = 'copy';
	event.dataTransfer.setData('text/plain', 'green');}
</script>
</head>
<body>
<div draggable="true" ondragstart="start(event)"/>
</body>
</html>